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Csimbi
I post too much
 Reputation: 98
Joined: 14 Jul 2007
Posts: 3362
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 Posted: Wed Mar 04, 2026 5:37 pm Post subject: Break on register and pass count |
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Hiya LUA masters,
I would like to come up with a scriptlet to a complex breakpoint condition.
This is what I am thinking about.
| Code: | --the register values like EAX and EBX can be read here.
--Changing them has no effect though
--Note: Keep in mind hexadecimal values start with 0x
--return (conditon) --return a non-zero value if you want to break
local passcount=0
passcount=passcount+1
if RSI==0x1847E621C0 and RAX==0x250 and passcount==2 then return (1)
return (0)
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Above code does not break.
I guess the problem is, if the code gets executed each time the breakpoint is hit, passcount will be always reset to zero and it never gets to 2.
Any ideas?
Additionally, does this work for break and trace?
If I change the breakpoint conditions manually where I set the trace.
Thank you!
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AylinCE
Grandmaster Cheater Supreme
 Reputation: 37
Joined: 16 Feb 2017
Posts: 1556
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| Posted: Thu Mar 05, 2026 1:33 am Post subject: |
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If you assign a "passcount" each time, your loop will only see 1.
| Code: | | local passcount = 0 |
Assign it if it doesn't exist, overwrite it if it does, add it:
| Code: | if passcount == nil then passcount = 0 end
passcount = passcount + 1
print(passcount) |
-----------------------------------------
The main gap here is when the loop is updated.
If you don't reset "passcount" after the current condition (2), the loop can never return to 2.
In this case, you have to check for multiples of two instead of "passcount==2":
| Code: | | if passcount % 2 == 0 then --> 2.. 4.. 6.. 8 ... |
---------------------------------------------
However, I recommend adding a refresh condition and resetting the counter back to 0 at the expected time.
Also, it might be more appropriate to increment the counter only when the specified conditions are met (if RSI and RAX...).
The decision is yours, and here's an example with explanations:
| Code: | -- Global persistence: If passcount doesn't exist yet, initialize it to 0.
-- Since we don't use 'local', this value stays in memory between hits.
if passcount == nil then passcount = 0 end
-- Logical Filter: Only increment the counter if our specific registers match.
-- This ensures we are counting the specific event, not just every time the code runs.
if RSI == 0x1847E621C0 and RAX == 0x250 then
passcount = passcount + 1
-- Hit Target: Check if this is the 2nd time the condition is met.
if passcount == 2 then
passcount = 0 -- Self-Reset: Prepare for the next cycle (2nd, 4th, 6th...)
return 1 -- Trigger: Return non-zero to break the execution.
end
end
-- Default: Return 0 so the debugger continues running without stopping.
return 0 |
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